P3.4 Sound

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Last updated 12:13 AM on 7/15/26
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6 Terms

1
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What type of waves are sound waves?

  • Sound waves are longitudinal waves, meaning that they require a medium to be transmitted

    • Sound waves produce regions where air particles are closer (compressions) and further away (rarefactions)

<ul><li><p>Sound waves are longitudinal waves, meaning that they require a medium to be transmitted</p><ul><li><p>Sound waves produce regions where air particles are closer (compressions) and further away (rarefactions)</p></li></ul></li></ul><p></p>
2
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How does changing amplitude affect sound?

  • Changing amplitude = changes how loud the sound is

3
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How does changing frequency affect sound?

  • Changing frequency = changes pitch of sound

4
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What is an echo?

  • Sound waves can reflect when they reach a boundary between materials

  • A reflected sound wave is called an echo

<ul><li><p>Sound waves can reflect when they reach a boundary between materials</p></li><li><p>A reflected sound wave is called an echo</p></li></ul><p></p>
5
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What is an ultrasound?

  • Our ears can detect frequencies between 20 Hz (20 vibrations per sec) and 20 kHz (20,000 vibrations per sec)

  • Sounds above 20 kHz are known as ultrasound

6
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State the speed of sound in different states of matter from fastest to slowest

  1. Solids

  2. Liquids

  3. Gases